Hammer mill



April 8, 1958 r H. D. SCHUTTE 2,829,839

HAMMER MILL Filed April 19 1957 2 Sheets-Sheet 1 All l6 l 4 INVENTOR. v 4- v Herman D.Schuhe awmadgfi ATTYJ United States Patent 2 HAlVlMER MILL Herman D. Schutte, Williamsville, N. Y., assignor to Schutte Pulverizer Co., Inc., Buffalo, N. Y.

Application April 19, 1957, Serial No. 653,863

3 Claims. (Cl. 241-89) This invention relates to screen mills and more particularly to screen mills or pulverizers provided with an improved sizing screen mounting assemblage.

In the use of screen mills or pulverizers, a problem arises whenever the sizing screen requires replacement or change and, as will be. obvious, it is desirable to provide means for mounting the screen which will enable it to be removed andreplaced in a minimum of time.

It is, therefore, of primary concern in connection With this invention to provide an improved screenmill or pulverizer assemblage incorporating an easy and rapidly replaceable screen.

Another object of this invention is to provide improvements in hammer mills and pulverizers of the character set forth wherein an articulated linkage assembly is utilized to bind the sizing screen in place and hold the same in operative position during operation of the mill and wherein simply and easily operated actuating means is provided for moving the binding means between released and engaged positions.

Another object of this invention is to provide a mill of the character described having an improved arrangement for quickly and easily exchanging product screening members thereof so as to grade the mill product to different specifications.

With the above and other objects in view, the invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings and pointed out in the claims hereto appended, it being understood that various changes in the form, proportions, and minor details of construction, within the scope of the claims, may be resorted to without departing from the spirit or sacrificing any 'of-the' advantages of the invention.

In the drawings: I

' Fig; 1 is aside elevational view of a screen mill constructed in accordance with thisinvention with portiops' thereof broken aw'ay to 'showinternal details of con-' struction; "Fig. 2 is a front elevational view of the assembly shown in'Fi g. l, a portion thereof being broken away to more clearly illustrate details of construction of the binding apparatus and the screen member;

Fig.3 is a partial perspective view of the actuatingv lever system for the screen binding means;

Fig. 4 is an elevational view showing a portion of the sizing screen; and

'-Fig. 5 is a vertical section taken through a portion of the machine illustrating the clamped position of the sizing screen.

Referring at this time more particularly to Figs. 1 and 2, reference numerals and 11 indicate a pair of vertical side wall members forming at once side wall portionsof the-mill casing and'support means for variousv portions; of the assemblage as will hereinafter become apparent.

1 Secured in outstanding relationship to the opposite side wall members 10 and 11 are the horizontally dis- .cured at opposite edges thereto.

pose of providing sufiicient rigidity and support therefor,

each of such bearing shelf members has associated therewith a pair of upstanding legs 14 and 15 having feet such as the foot 16 shown in Fig. l engageable with the supporting surface and disposed between the legs 14 and 15 is a strut plate 17, the legs and the strut plate all being rigidly aflixed to their associated shelfs and to the outer surface of their corresponding side wall members 10 or 11 so as to provide a rigid support. The bearing sup port assemblages on opposite sides of the machine are adapted to mount pillow block members, not shown, which in turn support the opposite end portions of the mill drive shaft which carries, within the'casing, the rotor upon which are mounted a series of hammers to effect the pulverizing action within the casing. The construction of the rotor, hammers, drive shaft and pillow blocks has not been shown for the purpose of clarity but is intended 'to be similar to that shown in our Patent 2,532,262, issued November 28, 1950.

Each sidewall 10 and 11 is cut away along the lin 18 and 19 as is shown in Fig. 1, each of the edges defining such lines intersecting the semi-circular edge portion 20 in each side wall which is adapted to'pass the rotor drive shaft therethrough and filling in the cut away portions of the side walls are the side wall portions '21 of the swingable cover assembly indicated generally by the reference character 22. The cover side Wall portions 21 are provided with semi-circular cut-away portions 23 mating with the previously mentioned portions 20 so as to effect the complete circular opening through which the drive shaft for the rotor. passes. i

The two sidewalls 10 and 11 are interconnected by means of the front and back wall members 24 and 25 and in their upper regions are interconnected by a top wall member 26. Swingably secured along the lower horizontal edge of the top ,wall portion 26 by means of a hinge 27 is the cover front plate member 28 to which the aforementioned cover side wall portions 21 are se- The side walls It and 11 carry the fixed bracket elements 29 and 3t) and the swingable cover carries the corresponding fixed bracket members 31 and 32 which are disposed in the relative positions shown when the swingable cover is in the closed position and which are securely fastened together, such as by the bolts 33 and 34 serving to maintain the cover in fixed closed position.

For the purpose of assuring that the swingable'cover is held in proper register with relationship to the side walls, each of the side walls is provided with a guide strap such as those indicated by the reference characters 35 and 36 which are rigidly affixed to their corresponding side; walls 10 and 11 and overlap the forward edges there The straps 35 and 36 are adapted to closely engage the outer surfaces of,

of, as is most clearly shown in Fig. 1.

the opposite side walls 21 of the cover assembly when the same is closed.

Fixed between the side walls 10 and '11 is a horizontal. mounting plate 37, see Fig. l, which preferably is joined: to the upper edge of the rear Wall member25. An. arcu-- ate plate 38 is also disposed in bridgingrelationship between the walls 10 and 11 and forms the upper rearcon-a fines of the mill casing. Extending fromthe lower edge of the arcuate plate 38 along each side wall to a pointat the line of juncture between the cover 22 and the side posite side edges ofthe sizing screen thereto are the arf v Patented 'Apr. 8; s

ticulated linkage assemblage such as that indicated in full lines in Fig. 1 and designated by the reference character 41. One such articulated linkage assemblage is provided in conjunction with each of the ledge members 39 adjacent opposite inner sides of the side walls and 11.

The side walls 10 and 11 extend. forwardly of the mill casing proper and carry a pivot shaft member 42' therebetween, the same being secured rotatably in the. opposite side walls in any suitable manner and this shaft projects a substantial distance from the side wall 11 and has attached to such projected portion a hand lever element 43 carrying at its lower extremity a transverse handle member 44 having an inner extension 45 adapted to engage the vertical edge of the side wall 11 and hold this link in place as will hereinafter be more readily understood when the binding means 41 are in operative position. The outwardly projecting portion 46 of the handle forms a portion which may be readily and easily grasped by an operator for actuating the linkage.

An idler shaft 47 is journalled between the side walls 10 and 11 in elevated relationship to the previously mentioned shaft 42 and this shaft has rigidly affixed thereto a pair of operating arms 48 and 49 which extend rearwardly therefrom in one position on the linkage for connection to the binding linkage assemblies 41. The two arms 48 and 49 are fixed to the idler shaft 47 just inside the corresponding side walls 10 and 11 and the idler shaft 47 projects a substantial distance beyond the side wall 11 and has secured thereto an operating'lever 50 which is linked at its free end to the upper end of the actuating lever 43 by means of the strap element 51, the strap element being pivotally pinned to the elements 43 and Si) by means of the pivot pin members 52 and 53 respectively. From the position of the parts shown in Fig. 1, it will be appreciated that the actuating linkage assembly 43, 51, 50 and 49 is in an overcenter relationship with respect to the shaft 42 so that tension exerted on this linkage assembly will serve to maintain the handle extension 45 forcibly engaged against the vertical edge 54 of the side wall 11, thus locking the assemblage in place.

Each binder assembly comprises a series of articulated link members. The link connection to the arms 49 coniprises a pair of spaced links 55 and 56 straddling the respective arms 48 and 49 pivotally pinned thereto and every other link mechanism of the systems 41 is a double linkage mechanism, whereas the intermediate link mecha nisms are single links such as those indicated by the reference character 57 which are disposed between the pairs of the adjacent mechanisms which they interconnect, there being provided suitable articulating pins such as the pin 58 between adjacent link mechanisms. The operation of the system will be readily appreciated inasmuch as when the lever 43 is swung'clockwise about the shaft 42 in Fig. 1, the over-center relationship of the lever 43 and link 51 will be broken andthe arms 48 and 49 will be swung downwardly to release the binding linkage assembly 41 from clamping engagement with the opposite side edges of the sizing screen 40. Thus the screen may be readily and easily withdrawn and a different screen inserted in its place.

The linkage assemblies 41 are each anchored to the mounting plate 37 at the rear side of the machine by means of depending ear members 60 fixed to the undersurface of the mounting plate and carrying pivot pins 61 serving to anchor the linkages to the frame of the machine.

To further enhance the clamping action of the articulated linkage system on the sizing screen and to assure the proper positioning thereof, the screen is provided with a transverse strap 62 along one edge thereof, as is seen most clearly in Fig. 4. The strap may be secured to the screen by a series of suitable fasteners 63 and a handle 64 is preferably provided to permit ready manipulation of the screen. Extending between the side pieces 10 and 11 is a plate element 65 which is rigidly secured to the shaft 47 by any suitable means, such as the depending ear elements 66 as is shown in Fig. 5. In any event, the plate 65 is rigid with the shaft 47 and turns therewith. The plate extends forwardly such that it presents a marginal edge portion 67 which engages under the strap 62 and serves to properly position the sizing screen in place, see particularly Fig. 5. When the handle 43 is swung upwardly such as to release the linkages 41, the plate 65 is swung downwardly also as is shown most clearly in dotted lines in Fig. 1 so as to present an opening permitting the screen to be easily grasped and removed and permitting a new screen to be placed in the machine.

I claim:

1. In a sizing mill, a casing assembly having a pair of rigidly interconnected upstanding side walls, a mill front cover hingedly connected along its upper edge to said casing assembly for upward swinging movement to provide access to the interior of said casing, an arcuate plate extending between and rigidly fixed to said side walls to form an upper rear wall of said casing and having its forward edge spaced from said cover to present a feed inlet opening into the casing, a generally semi-circular ledge fixed to the inner surface of each side wall and extending between the lower edge of said arcuate plate and the lower edge of said cover when closed, a perforate screen member engaged against the undersurfaces of said ledges to define a perforate intermediate wall for the casing to permit pulverized particles to pass therethrough, said side walls being closed by end walls at their opposite ends below the level of said screen member to provide a closed bottom casing receiving the pulverized particles passed by said screen, one of said end walls being spaced at its upper edge from said front cover when the latter is closed to provide a screen change aperture, and means for releasably holding said screen against said ledges and for closing said aperture, said means comprising a closure plate pivoted to said walls and operatively connected to an over center toggle link system engaging at opposite sides of the mill paired series of articulated links each series of which is fixed at one end to a casing side wall adjacent the lower edge of said arcuate plate and engaged at the other end by said over center toggle link system,

whereby when said closure plate is swung open and the toggle link system released the screen may be removed and replaced through said aperture.

2. In a sizing mill, a casing assembly havingimperforate side and top walls for confining a product being pulverized and having a removable, arcuate, perforate screen forming the bottom wall thereof to pass pulverized particles, an arcuate ledge fixed to and extending inwardly from each side wall, the opposite side edges of saidscreen being engaged against said ledges, articulated link means clampingly engaging said opposite side edges of the screen against said ledges, wherein said articulated, link means includes a series of end connected links disposed adjacent each of said ledges with each such series of links being pivotally connected at one end to the inner surface of a corresponding side wall adjacent the rearward portion of the associated ledge, each series of links extending from its point of fixed connection along its corresponding ledge and terminating adjacent the forward edge thereof, and means for selectively releasing the links including a pivot shaft extending between said side walls adjacent the forward edges thereof, an actuating shaft journalled between said side walls above said pivot shaft, means interconnecting said shafts including a handle for rotating said pivot shaft and rotating said actuating shaft, and a pair of arms rigid with said actuating shaft and extending rearwardly therefrom for pivotal connection to. said'series of links.

3. In a sizing mill, a casing assembly having a pair of rigidly interconnected upstanding side walls, a front cover connected between said side walls, an arcuate plate extending between and rigidly fixed to said side walls to form an upper rear wall of said casing and having its forward edge spaced from said cover to present an inlet opening into the casing, a generally semi-circular ledge fixed to the inner surface of each side wall and extending between the lower edge of said arcuate plate and the lower edge of said cover when closed, a perforate screen member engaged against the undersurfaces of said ledges to define a perforate bottom wall for the casing to permit pulverized particles to pass therethrough, and means for releasably holding said screen against said ledges whereby the screen may be removed and replaced wherein said means includes a series of articulated, connected links, each such series of links being connected at one end adjacent the lower edge of said arcuate plate at the rearward extremity of a corresponding ledge and extending therefrom beneath the respective ledge to terminate at its other end adjacent the forward end of the ledge, a pivot shaft extending between said side walls, a handle fixed to said pivot shaft extending at right angles thereto and having a hand grip member extending transversely of the lower free end thereof with a portion of such hand grip portion adapted to engage a vertical edge portion of one of the side walls, the opposite end of said handle being References Cited in the file of this patent UNITED STATES PATENTS 1,625,554 Liggett Apr. 17, 1927 1,645,770 Olson Oct. 18, 1927 2,076,025 Hazle Apr. 6, 1937 2,076,297 Gray Apr. 6, 1937 2,287,659 Bindner June 23, 1942 2,328,170 Schutte et a1. Aug. 31, 1943 2,532,262 Schutte et al Nov. 28, 1950 

